Step 1

Preheat oven to 350° F.

Step 2

Bake cookies according to package directions.Cool on baking sheet for 2 minutes; remove to wire rack to cool completely. Chop cookies into 1/2-inch pieces (about 2 cups).

Step 3

Line 8-inch-square baking pan with foil.

Step 4

Combine morsels and sweetened condensed milk in mediumheavy-duty saucepan. Warm over lowest possible heatstirring until smooth. Remove from heat; stir in 1 1/2 cups cookie pieces and vanilla extract.

Step 5

Spread evenly into prepared baking pan. Sprinkle with remaining 1/2 cup cookie piecespressing in gently. Refrigerate for 2 hours or until firm. Lift from pan; remove foil. Cut into 48 pieces.